There are 10 rounds left so each team can score a maximum of 20 more points.
28 points should be enough to make the eight, provided a team has a good for and against record. So to get to that number of points each team would need to win the following number of games:
Storm: already there as they are on 26 with a bye in hand.
Broncos: 2 wins from 9 starts
Sharks: 3 wins from 10 starts
Dragons: 2/9
Bulldogs: 3/9
Knights: 4/9
Sea Eagles: 4/9
Raiders: 4/9
Cowboys: 5/9
Tigers: 5/9
Panthers: 6/10
Warriors: 7/9
Roosters: 7/9
Eels: 8/10
Rabbitohs: mathematically impossible as of last weekend.
Looking at for and against the Raiders will probably need to win more than four games to be sure of a place as their for and against is pretty awful relative to their position on the table. The same goes for the Panthers, Roosters and Eels although given that they need to win most of their games anyway that's not such a worry for them. Finally the Rabbitohs awful record this year might push the cut-off point up as their lack of points will mean more competition points distributed amongst the other teams.